MySQL Tutorial

A database system used with PHP.

Chapter Quiz Exercises
Course Topics
MySQL Intro MySQL SELECT MySQL SELECT DISTINCT MySQL WHERE MySQL ORDER BY MySQL AND, OR, NOT MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN() and MAX() MySQL COUNT(), AVG(), SUM() MySQL LIKE MySQL IN MySQL BETWEEN MySQL Aliases MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL GROUP BY MySQL HAVING MySQL Create DB MySQL Drop DB MySQL Create Table MySQL Drop Table MySQL Alter Table MySQL Constraints MySQL Auto Increment MySQL Views

MySQL COUNT(), AVG(), SUM()

MySQL Aggregate Functions

  • COUNT(): returns the number of rows that matches a specified criterion.
  • AVG(): returns the average value of a numeric column.
  • SUM(): returns the total sum of a numeric column.

COUNT() Syntax:

SELECT COUNT(column_name) FROM table_name WHERE condition;

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Topics
MySQL Intro MySQL SELECT MySQL SELECT DISTINCT MySQL WHERE MySQL ORDER BY MySQL AND, OR, NOT MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN() and MAX() MySQL COUNT(), AVG(), SUM() MySQL LIKE MySQL IN MySQL BETWEEN MySQL Aliases MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL GROUP BY MySQL HAVING MySQL Create DB MySQL Drop DB MySQL Create Table MySQL Drop Table MySQL Alter Table MySQL Constraints MySQL Auto Increment MySQL Views